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Myra Breckinridge, the transsexual who terrorized Hollywood with dildo-rape and lesbianism, has transformed back into her former self, the literally and figuratively castrated Myron.

One night, while watching the movie "Siren of Babylon" on the late show, he/she is transported to the set of the 1948 film through the television. It's Myra's dream come true, and Myron's nightmare. As Myron tries to adapt to life inside an endlessly repeating B-movie, Myra slowly starts creeping her way back into Myron's head, making a connection with a gay member of the community to obtain dresses and wigs. Her lapses back into Myron's personality are strongly encouraged by a character slyly based on Norman Mailer (though at one point he drunkenly hits on Myra), while most of the others on the set seem to prefer Myra to Myron. She attempts to castrate a crew member, then tries to castrate herself and partially succeeds in acquiring silicone implants. While Myron desperately searches for a way off the set (running into Richard Nixon along the way, who is considering taking up residence in "Siren of Babylon" in order to escape the Watergate hearings), Myra wants to stay permanently.

Eventually, Myra/Myron trades places with Maria Montez, the star of the film. Myra is ecstatic and Myron disappears entirely from the narrative for a time. But when Montez, inhabited by Myra, coincidentally meets the 1948 Myron (who at this point is a child, possessed by the soul of a perplexed Maria Montez) their respective personalities are restored to their original bodies, returning Myron at once to his living room in 1970's California. However, the changes wrought by Myra's running amok on the set of "Siren of Babylon" continue to influence the present, and the book ends with a former cowboy actor in the film, now a transsexual, being elected Republican governor of Arizona.

In his introduction to the novel, Vidal mentions the Supreme Court decision Miller v. California, which in his words "leaves to each community the right to decide what is pornography." Saying that the decision has "alarmed and confused peddlers of smut" by eliminating guidelines, Vidal says he has decided to substitute the names of the five Justices who voted for the decision, plus the names of anti-pornography crusaders Charles Keating of Citizens for Decent Literature and Father Morton A. Hill, S.J. of Morality in Media (whom Vidal had debated on The David Susskind Show in 1968), for the "dirty words." He has done this to conform to the Supreme Court's imposition of the "community standards" test, as he wants "to conform with the letter and spirit of the Court's decision."